Sharpener



FIG. 1 is a perspective view of my invention for a sharpener;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side view thereof, the left side being a mirror image;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a sharpener, as shown. 